1. Department of Endocrinology, Cangzhou Central Hospital, 16 Xinhua West Road, Cangzhou City 061000, Hebei Province, PR China
2. Gynecological clinic, Cangzhou Central Hospital, Cangzhou City, Hebei Province, PR China
3. Department of Endocrinology, Cangzhou Central Hospital, Cangzhou City, Hebei Province, PR China